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ampage archive
Vintage threads from the first ten years
| previous: Charles Two things happen on those amps. |
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Re: Newbie: hum problem
 3/15/1999 12:08 AM |
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Giacomo | Re: Newbie: hum problem Thank you Charles, I will replace the pot as soon as possible (I have to understand the wiring) then I'll let you know. Here are more infos about this hum problem: 0- I replaced the filter caps some weeks ago. 1- I made a little mod converting extra-speaker out to direct out. I drilled the chassis (tubes pulled out but much vibration). 2- I turned on the amp, waited the time, standby on... hum, one minute... fuse blown. 3- Inspect the amp and found a broken resistor between pin 1 & 5 of one 6L6's. 4- Replaced the resistor, the hum is still there. 5- Inspected for something wrong in the power supply and found a broken joint at one of the caps which "bridges" the rectifier. Checked the other diode (bias?) by an ohmmeter, it seems ok when I pull it off the circuit. Leaving the diodes in the circuit they runs something in both direction (is it normal?) 6- Hum is still there. Giacomo |
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| Replies: |
| Bruce Yes, check the hum pot ASAP. |